Passive House Systems advises its customers using WUFI® software, which is fully compatible with BS EN 15026, and dynamically predicts moisture movement and storage as well as condensation for each location. Using WUFI® enables architects, designers and developers to identify the likelihood and risks of condensation, and enables designs to be optimised for longevity of the building fabric, and for the health and wellbeing of the buildings occupants.
WUFI® is an acronym for Wärme Und Feuchte Instationär, which, translated, means heat and moisture transiency.
WUFI® software was developed by the Fraunhofer Institute for Building Physics in Germany and provides detailed heat and moisture calculations based on local climate conditions for building materials, multilayer components and even whole buildings.
The designer is able to achieve a minute-by-minute prediction over a given period of years, as specified by the designer. The programme considers a worst-case scenario with the injection of a moisture source at the source to predict the robust drying out of the fabric build up.
A further enhancement of using the WUFI® software is that external weather including driving rain and solar radiation is predicted in a cycle and the designer can choose the specific internal environment that the building will be exposed to. This has proven invaluable when assessing the correct position for high performance vapour control and vapour permeable membranes to ensure a healthy building fabric, whether it be roofs or walls.